A federal appeals court sanctioned two California lawyers on Thursday over a lawsuit they filed, dismissed as frivolous, that accused former officials in the Bush administration of allowing the September 11 Pentagon attack to occur as part of a broad conspiracy.

The U.S. Court of Appeals for the 2nd Circuit ordered the two lawyers to pay $15,000 total in sanctions in addition to double an unspecified amount the government spent defending the case.

Three attorneys — Dennis Cunningham, William Veale and Mustapha Ndanusa — filed the lawsuit in 2008 on behalf of April Gallop, a member of the U.S. Army injured in the Pentagon attack on September 11, 2001.